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-gram
something written
ex-echocardiogram
-graph
writing apparatus
ex- mammograph
-graphy
use of writing apparatus
ex-radiography
hem-
blood
ex-hemoglobin
hemi-,semi-
half
ex-semi circle
hepat-
liver
ex- hepatitis
hex-
six-hexagon
hist-
tissue
ex-histology
hyper-
over, excessive
ex- hyperexcessive
hypo-, infra-, infer-, sub-
under, below, less
ex- hypoallergenic